I've had both. The L&S boots were the nicest construction out of any I've had (L&S, Lowa, Crispi, and Merrill). If the L&S last fits your feet that would be my vote.
Stephen and James Lathrop were great to work with. Ultimately the L&S boot didn't work for my foot so we went to a Lowa Tibet though. Also a good boot but the construction/quality seems to be a step down from the Lathrops. Right now I've got Crispi Colorado's and Lowa Tibets. I like both and will use the colorado's in the early season and the Lowa's later. Jury is still out on long term durability.
I beat the crap out of the L&S boots in New Mexico and they held up great (not the ones in the photo).
Some pics from last years boot testing. I ordered from BlackOvis and GoHunt, found my size, and wore them around the house a bit to figure out what worked for me. Not all boots shown in the pictures. Yes it was expensive (temporarily) Both companies were fantastic to work with on the phone and with their return policies though. I tried on the following.
L&S Mountain Hunters
Crispi Colorado
Crispi Guide
Crispi Nevada
Crispi Wyoming
Crispi Idaho
Crispi Valdres
Lowa Tibet
L&S by far had the nicest construction. Seemed to have thicker/stiffer leather. Waterproofing is eVent rather than goretex. Lacing system was great as well but the ankle area had a lot of volume and my chicken legs wanted to move around unless i really cranked them tight. Rubber rand is thick and held up well through the Florida mountains in New Mexico. Great customer service.
Crispi's seemed to have very soft/supple leather. Potentially a bit thinner than the others but that's a subjective comment. I suspect that's why many people find them the most comfortable out of the box though. I archery elk hunted with the colorado's and they kept my feet dry. I also wore them in the snow in October in WY and didn't have any issues (I re-waterproofed them between hunts w/ Granger Repel). I put the L&S insoles in them. Good stiffness/rocker. Lacing system is fine but not as nice as L&S or Lowa. I really wanted to like the Nevada's but the toebox was ever so slightly different than the CO's and my foot slipped a bit due to the heel pocket. I did not like the Idahos/wyomings due to the heel pocket. Valdres aren't as heavy duty of a boot. Lacing is good but nothing special. Only 2 tabs above the lock until you get to the 10" boots.
Lowas - I haven't hunted in these yet. I wore Camino GTXs in 2018 and liked them but ultimately ended with blisters so I returned them to REI. They kept me dry through some major rainstorms. The Caminos appear to be well made and a little heavier duty construction than the crispis (again a subjective opinion). I will start wearing these with a weighted pack in spring. I bought these through L&S and they modified the toebox for me to eliminate a little bit of rubbing when I tried them on. Jury is out but I think they'll be good. Good lacing system w/ 3 posts above the lock. Also has a locking tab at the top of the foot before you get to the ankle lock so you can truly independently tension the top and bottom portion of the boot without any special knots. Also has a post in the middle of the tongue to keep it centered which I like.
Some of the contenders. L&S are in the middle w/ no box.
Valdres, Colorado, Idaho, Nevada, L&S
Nevada and L&S
Nevada and Tibet
Nevada and Tibet